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Commit 16d279d2 authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
Browse files

[PATCH] x86: Fix verify_quirk_intel_irqbalance() 



Fix verify_quirk_intel_irqbalance(). genapic checks should really
happen only on affected versions of the E7520/E7320/E7525 based platforms.

AK: This should akpm's Coyote SDV

Signed-off-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent e0f27981

arch/i386/kernel/quirks.c

+29 −4
Original line number Diff line number Diff line
@@ -10,6 +10,26 @@ 
#if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)

static void __devinit verify_quirk_intel_irqbalance(struct pci_dev *dev)

{

	u8 config, rev;

	u32 word;



	/* BIOS may enable hardware IRQ balancing for

	 * E7520/E7320/E7525(revision ID 0x9 and below)

	 * based platforms.

	 * For those platforms, make sure that the genapic is set to 'flat'

	 */

	pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);

	if (rev > 0x9)

		return;



	/* enable access to config space*/

	pci_read_config_byte(dev, 0xf4, &config);

	pci_write_config_byte(dev, 0xf4, config|0x2);



	/* read xTPR register */

	raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word);



	if (!(word & (1 << 13))) {

#ifdef CONFIG_X86_64

		if (genapic !=  &apic_flat)

			panic("APIC mode must be flat on this system\n");
@@ -19,6 +39,11 @@ static void __devinit verify_quirk_intel_irqbalance(struct pci_dev *dev) 
#endif

	}



	/* put back the original value for config space*/

	if (!(config & 0x2))

		pci_write_config_byte(dev, 0xf4, config);

}



void __init quirk_intel_irqbalance(void)

{

	u8 config, rev;